When your car's Check Engine light comes on, it's usually accompanied by a sinking feeling in the pit of your stomach. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap.
If you experience any bleeding period after this 20 days, it will probably be the real period. This normally comes at about 4 to 6 weeks after the miscarriage.
It usually takes four to six weeks for your periods to return after a miscarriage, although it can take longer to settle into a regular cycle. The length of time it takes will depend on how regular your periods were before your pregnancy.